Crushing and grinding mill



(No Model.)

H. L. LIGHTNER 8v J. J. NEWSOM.

GRUSHING AND GRINDING MILL.`

No. 542,087. Patented July 2, 1895.

IIIIIIIII IINTTED STATES PATENT OFFICE..

HENRY L. LIGHTNER, OF SAN FRANCISCO, AND JOHN J. NE'WSOM, OF OAK- LAND,ASSIGNORS, BY MESNE ASSIGNMENTS, TO H. L. LIGHTNER, H. C. BIGGS, AND O.C. HASLETT, OF SAN FRANCISCO, AND .IESSIE L. NEVSOM,

OF OAKLAND, CALIFORNIA.

CRUSHING AND GRINDING MILL.

SPECIFICATION forming part of Letters Patent No. 542,087, dated J' uly2, 1895. Application filed September 13, 1894. Serial No. 522,939. (Nomodel.)

To all whom it may concern:

Be it known that we, HENRY L. LIGHTNEE, residing in the city` and countyof San Francisco, an'd JOHN J. NEwsoM, residing in Oakland, Alamedacounty, State of California, citizens of the United States,`haveinvented an Improvement in Crushing and Grinding .Mills and we herebydeclare the following to be a full, clear, and exact description of thero same. y Our invention relates to that class of mills for breaking upand reducing rock, ore, and

other materials, in which a muller, operating within a mortar, hasimparted to it a wabblin g I5 motion over a xed die in the mortar andabout a central cone therein by means of a crank-pin applied to it.

Our invention consists of the constructions and combinations'of deviceswhich we shall zo hereinafter fully describe and claim. l

The object of our invention is to increase the eflciency of a mill ofthis general character, not only with respect to its grinding orpulverizing action, but also to adapt it, by

z 5 reason of the strength, shape, and weight of itsparts, andespecially of its muller, the hopper, and position of driving-shaftcrank, to the crushing of rock.

Referring to the accompanying drawings 3o for a more completeexplanation of our invention, Figure l is a vertical section of ourmill.

Fig. 2 is a horizontal section on line yy of Fig.

l. Fig. 3 is a modification of the crank-pillengagement with themuller-top.

A is a mortar having in its center a high cone a, tothe base of which isfitted a wearing-casing ct. In the bottom of the mortar is the die B,the 'surface of which, though it may in some cases be ievel,ispreferably sloped inwardlyas shown. The sides of the mortar at thebottom slope outwardly and upwardly for some distance, thus providing aplace for the amalgamating or copper plates C, and said sides then risevertically and are formed with 45 the usual screen-covered apertures a2.

D represents the muller generally. It is a hollow shell or casting of acylindrical or other shape. .We have here shown it in the shape of afrustum of a cone. Its lower end and on the inside near lower end isfitted with `the shoe E, which is secured to. it in any suitable manner,a good way being, as here shown, of a ange e of a shoe-section tting ina dovetailed groove in the muller and secured by a key e. About theouter surface ofthe lower end of the muller may be a strengtheningbande2 of steel. The bottom or wearing face of theshoe is made to conform tothat of the die upon which it rests, and the inside circumference :isshaped so as to form the jaw of a rock-breaker, acting in connectionwith the cone wearing-plate a. Around the exterior on the side of themuller is formed or secured a hopper F, which communicates Withinwardly-sloping walls on the mulleror directing the material to theinterior of the latter, said hopper also communicating with feed-ports dmade through the Walls of the muller contiguous to the sloping wallsinto its interior. This hopper is` made large enough to receive the rockfrom the chute of the feeder. V

The hopper is preferably formed with small sloping divisional walls f,which serve'to agitate the material as the muller is wabbled and betterdirect it toward the feed-ports.

G is the driving-shaft, which rises from bel low through the centralcone a of the mortar. This shaft is driven from below by any suitablemechanism-as, for example, by means of the pulley g upon it driven bybelt g from an exterior pulleyg2 on a power-shaft g3.4

VUpon the upper end of the vertical shaft G, where it rises above thecone a, is a crank H, in the end of which isapin I, which passes upfreely through the top or cap-piece off the muller D. In 'order toprevent wear upon this crank-pin and reduce friction, we t it with anexterior loose sleeve c', ora sleeve with a globe-joint intop of mullermay be used, asshown in Fig. 3.

The operation of the mill is as follows: The material to be crushed andground is supplied to the hopper F and passes down through thefeed-ports el inthe side of the muller into the interior of the muller.Rotation being imparted to the drive-shaft G, the muller, by means ofthe crank H aud the pin I, is given a wabbling motion whereby thematerial is first or partially crushed between the conecasing et and theinner face of the shoe E, and is then fully crushed and ground orpulverized between the lower face of the shoe and the face of theunderlying die B.

It will be observed that the hopper F projects well beyond the side ofthe mortar. This is for the purpose of-enablingit to reach and operatemechanism for actuating the selffeeder and to balance the muller by itsweight.

lt is not necessary herein to show the selffeeder7 it being sufficientto state that J is a tappet-lever,one end of which lies just under theouter edge of the hopper F, and the other end of which may be supposedto operate mechanism connected with the self-feederin v a way which iscommon to all this class of devices. Now, when the material in themortar gets low and more is needed, the muller comes down far enough toenable its hopper F to come in contact with and operate the tappet-leverJ.

The object of inwardly sloping the die B of the mortar is to create atendencyin the material being crushed to keep down toward the center,thus giving full opportunity to grind it and permittingit only to passupL the slope and escape when forced to do so by a continuance of theoperation, and when fine enough tobe washed out by the flow of waterwhich passes in with the ore or rock.

Heretofore in this class of mills the Wabbling muller has been providedwith an upwardlyextending pin or arm engaging a crank on a drive-shaftlocated and mounted above. The overhead framework necessary for thisarrangement and the general inconvenience of such a construction made itimpracticable to easily remove the muller from the mortar when required;but by driving from below, as in our mill,leaving the top entirely free,it is obvious that the entire muller can be lifted off the crank-pin andremoved from the mortar with facility, thus giving opportunity forrepairs and cleaning.

In the previous mills the mullers were comparatively Hat and low,besides being small and light, fitting well down within and beingentirely inclosed by the mortars. They were not hollow inclosed shells,but were mere rings having open spiders above, from whichV a pin or armextended upwardly to the driving-crank. Neither great momentum norefficiency could be obtained by this construction because of thelightness of the muller,

its distance from the line of lcrank-rotation,

its location at the point of least motion, and the difficulty of drivingit through a long arm or pin; but in ourconstruction by making themuller-shell of a cylindrical, conoidal, or other inclosed shape andhaving it rise wellv above the mortar, and to the line of crank-motionwe obtainl a great weight efliciency in crushing and also give anopportunity of acquiring increased momentum and centrifugal force whichbalances the muller during its wabbling movement and also morefullyprotecting the driving mechanism inclosed within. The capacity ofthe feedports d into the muller is purposely made small enough toprevent. the entrance of any rock too large to be properly handledbetween the crushing surfaces below.

For the purposes of oiling we have a hole K leading down into the spacebetween the loose sleeve/L' and the crank-pin I, said spacecommunicating with a small chamber 7c in the top of the crank, fromwhich a holle 7c leads lthrough the crank to andaround the severalspaces within the central cone a about the 'driving-shaft G.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

l. A crushing and grinding mill comprising a mortar havinga central coneand outwardly and upwardly sloping sides terminating in verticalencircling sides provided with screen openings; an inwardly sloping diein the bottom of the mortar, a muller of conoidal form surrounding thecentral cone of the mortar having a shoe on the inside near its lowerend so that its inner surface may crush the material prior to itsfurther reduction between the bottom of the shoe and the die in themortar, said muller havingits upper portion provided with inwardlysloping walls for directing thc material between its inner walls and thecentral cone of the mortar, with feed openings through the sides of themuller commuicating with the interior thereof; a hopper surrounding themuller andconnected and movable with it, a rotary shaft Vdriven frombelow and passing up through the cone of the mortar, a crank on the topof the'shaft within the cone of the muller, and a crank pin fittedloosely through the top of the muller, substantially as hereindescribed.

2. In a crushing and grinding mill having a mortar provided with acentral cone, amuller of conoidal form, and a driving shaft passingupwardly through the cone and driven from below, a crank on the top ofthe shaft and fitting the top of the cone, a chamber in the top of thecrank with aport leading therefrom through the crank to the space in thetop of the cone, a crank pin projecting upwardly from the crank and aloose sleeve on the pin passing` loosely up through the top of themuller and having its lower end fitting the chamber in the top of thecrank.

3. In a crushing and grinding mill, the combination of a mortar having acentral'cone, a muller having an encirclinghopper and feed ports throughits walls, and the means for wabbling the muller within the mortar aboutits central cone, consisting of the uprising central shaft driven frombelow, the crank on the shaft and a crank pin passing freely through IOOIIO

, mechanism for operating a self-feeder, substantially as hereindescribed.

5. In a crushing and grinding mill, the combination, of a mortar havinga central cone, a

hollow shell forming a cylindrical or conoiclal 15 muller, a nongyratory shaft passing .up through the central cone of the mortar,having a crank pin fitted thereto just below the top of the muller, andpassingloosely through the same, and means for rotating the shaft.

In Witness whereof we have hereunto set .our hands.

HENRY L. LIGHTNER.

JOHN J. NEWSOM.

Witnesses: Y

T. J. LENNON, S. H. NOURSE.

